takes user input for a number and squares it. Written in MASM32 x86 assembly

square_a_number.asm

include \masm32\include\masm32rt.inc


.data
prompt db "input a number to square here: ", 0
prntNumBuffer dw ?
prntSqrBuffer dw ?
prompt2 db "your number was: ", 0
prompt3 db "the square is: ", 0
square dw ?
success1 db "Successfully squared your integer. ",13,10,0
integer dw ?
newline db 13,10,0
dummy db " ",13,10,0 ; dummy variable to print a new line

.code

start:
 invoke StdOut, offset prompt ; prints the prompt
 
 invoke crt_scanf, chr$("%d"), addr integer

 invoke StdOut, offset prompt2 ; prints the prompt2

 movzx eax, integer     ; move number to convert to string into eax
 lea edi, prntNumBuffer ; buffer to store converted number in
 call to_string         ; convert number to string before printing
 
 invoke StdOut, offset prntNumBuffer ; print the inputted number
 invoke StdOut, offset dummy         ; print a new line

 push offset integer
 call square_number     ; square the number using square_number proc=

 movzx eax, square
 lea edi, prntSqrBuffer
 call to_string  ; convert the squared input to string

 invoke StdOut, offset prompt3 ; print the prompt3
 invoke StdOut, offset prntSqrBuffer ; print the square 
 invoke StdOut, offset dummy         ; print a new line
 
 invoke StdOut, offset success1
 

square_number PROC
 mov ax, integer
 mov cx, integer
 mul cx                ; multiply ax=ax*cx where cx=ax=integer
 mov square, ax        ; move the result from ax->square

 ret
square_number ENDP

to_string PROC ; converts a decimal number to a string
 mov ebx, 10
 xor ecx, ecx

repeated_division:
 xor edx, edx
 div ebx
 push dx
 add cl,1
 or eax,eax
 jnz repeated_division

load_digits:
 pop ax
 or al, 00110000b ; transforms to ascii
 stosb  ; store al into edi. edi = pointer to buffer
 loop load_digits
 mov byte ptr [edi], 0
 
 ret

to_string ENDP

exit
 
end start